Method of producing hollow magnesium fluoride particles, and antireflection coating, optical device, and imaging optical system having the particles
A technology of anti-reflection coating and hollow magnesium fluoride, which is applied in the field of optical devices and can solve the problems of particle detachment and reduced adhesion
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[0026] The preparation method of hollow magnesium fluoride particles according to the present invention comprises: mixing a hydrophobic solvent, a hydrophilic solvent and a surfactant to prepare droplets of the hydrophilic solvent dispersed in the hydrophobic solvent by forming micelles a solution of the hydrophobic solvent or a solution in which droplets of the hydrophobic solvent are dispersed in the hydrophilic solvent; and a step of synthesizing magnesium fluoride by adding a fluorine compound and a magnesium compound to the solution of the dispersed droplets.
[0027] Figure 2A with 2B Both are schematic diagrams showing the interface of the liquid droplets in the solution obtained in the step of preparing the liquid-droplet-dispersed solution. Figure 2A represents an example of a droplet of a hydrophobic solvent 22 formed in a hydrophilic solvent 23 using surfactant molecules 21 whose hydrophobic groups are oriented toward the hydrophobic solvent 22 and whose hydrophi...
Embodiment 1
[0046] An oil-in-water micellar solution dispersing 47 nm water particles (droplets) was prepared by stirring 100 g of isooctane, 10 g of AOT, and 30 g of water for 1 hour.
[0047] To the resulting solution, 10 g of a 5 wt % solution of TBAT in phenylmethyl ether was added to dissolve TBAT in the oil layer, and then mixed with 20 g of 1 wt % magnesium ethoxide in phenyl methyl ether while stirring at 60 °C. The solution in ether was mixed for 1 hour to synthesize magnesium fluoride.
[0048] To the solution containing the synthesized magnesium fluoride, 40 mL of ethanol was added to separate the hydrophilic solvent from the hydrophobic solvent. The hydrophilic solvent was dried, and then observed with a scanning transmission electron microscope (manufactured by Hitachi High-Technologies Corp., HD-2700) to confirm hollow particles having a particle diameter of 500 nm.
Embodiment 2
[0050] A solution of water-in-oil micelles was prepared in the same manner as in Example 1.
[0051] To the resulting solution, 10 g of a 5 wt % solution of TBAT in phenylmethyl ether and 5 g of AOT were added to dissolve TBAT in the oil layer, and then mixed with 20 g of 1 wt % magnesium ethoxide in The solution in phenylmethyl ether and 5 g of AOT were mixed for 1 hour to synthesize magnesium fluoride.
[0052] To the solution containing the synthesized magnesium fluoride, 40 mL of ethanol was added to separate the hydrophilic solvent from the hydrophobic solvent. The hydrophilic solvent was dried, and then observed with a scanning transmission electron microscope to confirm hollow particles having a particle diameter of 200 nm. The diameter of the cavity is 60% of the particle diameter, so the void content is 22%.
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